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The influence of accelerating voltage fluctuations on the synchronization bandwidth of a megawatt-class gyrotron
Russian version
Rozental R. M. 1, Fokin A. P. 1
1Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia
Email: rrz@ipfran.ru, fokin@ipfran.ru
PDF
For a 170 GHz gyrotron with the output power level of 2 MW, calculations were performed in the framework of the particle-in-cells method. Calculations were carried out according to the equivalent axially symmetric gyrotron model with taking into account electron energy fluctuations induced by fluctuations in the output voltage of the high-voltage power supply. The output radiation spectrum width calculated in this way (about 1 MHz) complies with the experimental data. With the aid of this model we have shown that, in the problem of gyrotron locking by an external signal, accounting for voltage fluctuations leads to a decrease in the design locking bandwidth: by 13% at the external signal power of 20 kW and by 27% at that of 5 kW. Keywords: gyrotron, frequency locking by an external signal, millimeter-wave radiation.
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